I recently found out that the "the customer is always right" is a bastardization of the original quote, "the customer is always right in matters of taste." I like this a lot better. It means if a customer to wants to pay you money for something weird to you, you should try to accommodate it (as long as its legal), but if a Karen demands a discount for no reason, the customer is not right.
That means its the start of me listening to at least two or three covers of Nightmare Before Christmas songs a day from now till New Years.